<!DOCTYPE html><html lang="en"><head><meta charset="UTF-8"><meta name="viewport" content="width=device-width,initial-scale=1"><title>Document</title><form action="/submit" method="post">Username: <input type="text" name="name"><br>Password: <input type="password" name="password"><br><label>sex:</label> <input type="radio" id="male" name="gender" value="male" checked="checked"> <label for="male">man</label> <input type="radio" id="female" name="gender" value="female"> <label for="female">woman</label><br><label for="age">age:</label> <input type="age" id="age" name="age" required> <button type="submit">注册/登陆</button></form></head><body></body></html>